DT-920
The tuner shall be a frequency synthesized AM and FM mono radio receiver with all electronic
controls. It shall receive the AM frequency band from 520 to 1,710k Hz in 10k Hz steps and FM
frequency band from 87.9 to 107.9 MHz in 200k Hz steps. The receiver capability can be
switched, using a power up function, to receive AM frequencies from 522 to 1,710k Hz in 9k Hz
steps and FM frequencies from 87.5 to 108.0 MHz in 50k Hz steps. This selection shall be
independently selectable for each band. AM sensitivity shall be 26 uV and FM sensitivity shall be
3 uV. A scan level switch shall select between low and high sensitivity for local/distant type
reception and be independently selectable for each band. The nominal audio output shall be -8
dB unbalanced with a noise level at least -70 dB at maximum FM quieting. Inputs shall be
provided for AM loop and 300 ohm FM antennas. The tuner shall provide four station selection
modes: direct entry, manual scan, automatic scan and automatic memory entry scan. Station
selection can be by station frequency or memory preset channel and this function along with the
first three selection modes shall be independently selectable for the AM and FM bands. The
fourth automatic memory entry scan shall scan the selected AM or FM band, starting from the
lowest end of the frequency range and automatically enter the first 20 stations received into the
memory presets. AM stations shall be stored in preset channels CH 21 to CH 40 and FM stations
into presets CH 1 to CH 20. The front panel shall have the following controls: BAND switch to
select the AM of FM band and changing reception frequency ranges; a up/down tuning bar for
station selection; an AUTO/MANUAL tuning selector, a SCAN LEVEL selector for local or distant
sensitivity; a MEMORY switch for entering a station into memory and for changing scan modes; a
DIRECT IN for selecting manual entry of the station frequency; a CH/FREQ switch to select
between scanning frequencies and memory presets; ten PRESET switches for recalling memory
presets and entering station frequencies and a POWER on/off switch. The rear panel shall have
two RCA type jacks wired in parallel for the audio output and four push-type terminals for
connection of the AM and FM antennas. One AM antenna terminal shall also connect internal to
chassis ground. A 300 ohm twin-lead dipole and AM loop antennas shall be included. An optional
rack-mount kit, shall allow mounting the tuner in a standard 19" equipment rack, occupying two
rack spaces. The tuner shall be enclosed in a durable, painted, black steel enclosure with a black
anodized, aluminum front panel. AC line Voltage shall be 120 V, 60 Hz. Power consumption shall
be 6W. Dimensions (W x H x D) shall be 16.54” x 3.27” x 10.63” (420 x 83 x 270 mm). Weight
shall be 6.17 lbs. (2.8 kg).

The AM/FM tuner shall be TOA model DT-920.
The rack-mount bracket shall be TOA model MB-DT920.